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The comparative form of rude is ruder, and the superlative form is rudest. It is common to form the comparative and superlative of short words like this by adding -er and -est.
The comparative form of risky is riskier, and the superlative form is riskiest. The word risky is short enough to form the comparative and superlative forms this way. For longer words, you would need to precede the word with more (for comparative) and most (for superlative).
I believe for words such as foolish you need to use more and most. Comparative: More Foolish Superlative: Most Foolish
In monosyllabic words, the comparative and the superlative are usually made by adding -er or -est respectively. For two syllables when the word ends in "y," change the "y" to an "i" and add -er and -est. For two syllables not ending in "y" and for words of more than two syllables, regardless of what they end in, the word is preceded by "more" or "most." The word "splendid" is no exception. The comparative is "more splendid," and the superlative is "most splendid."
more hopeless, most hopeless
"Higher" is the comparative of high. The superlative is highest.
Comparative: lazier Superlative: laziest
'Next' is a superlative; it means 'nearest'. The positive is therefore 'near' and the comparative is 'nearer'.
last
harmful
Comparative: easier Superlative: easiest
The comparative form of rude is ruder, and the superlative form is rudest. It is common to form the comparative and superlative of short words like this by adding -er and -est.
finer, finest
stronger and strongest
older, oldest
busier, and busiest
For words of two syllables not ending in y, use more for the comparative and most for the superlative.